The Heat is stuffed with high-end features and materials: Built with 100% of our ultra gooey UltraFlex DS Neoprene. FluidFlex™ Firewall in the chest and back make this suit warmer and more flexible than previous years. The Heat also includes exterior Fluid Seam Weld, redesigned zipper panel and easy-in-easy-out usability. Available in 3/2mm, 4/3mm and 6/5/4 Hooded models. O'Neill Heat Wetsuit 2016